Description

Routine passaging of human embryonic stem cells and induced pluripotent stem cells requires careful control of dissociation time and aggregate size. Excessive exposure to enzymatic dissociation reagents or overly vigorous pipetting can disrupt colonies, create aggregates that are too small, and increase cell stress. At the same time, cultures containing spontaneously differentiated areas may require additional manual selection before the undifferentiated population can be transferred.

XR InstantSelect hES/iPS Cell Aggregate Dissociation and Selection Reagent is an enzyme-free hESC and iPSC passaging reagent designed to combine rapid aggregate dissociation with selective detachment of undifferentiated cells. Its optimized ion-chelation approach supports non-enzymatic cell dissociation without the use of human- or animal-derived components or added protein.

During the recommended protocol, colonies are exposed to InstantSelect for 1 minute, the working solution is aspirated, and the plate is incubated for an additional 3 minutes. Gentle tapping and limited pipetting then release the undifferentiated portion as cell aggregates approximately 100–200 μm in diameter, while differentiated regions can remain attached to the culture surface.

This integrated dissociation and selection workflow is intended to simplify routine human pluripotent stem cell passaging, reduce unnecessary mechanical manipulation, and help researchers obtain appropriately sized hESC or hiPSC aggregates for subsequent culture.

Specifications

Product Name	XR InstantSelect hES/iPS Cell Aggregate Dissociation and Selection Reagent
Product Type	Enzyme-free human pluripotent stem cell passaging reagent
Catalog Numbers	XRINSELECT-1-100 / XRINSELECT-1-500
Available Sizes	100 mL / 500 mL
Applicable Cell Types	Human embryonic stem cells (hESCs) and human induced pluripotent stem cells (hiPSCs)
Dissociation Format	Cell aggregate or clump passaging
Recommended Aggregate Size	100–200 μm
Recommended Exposure	1 minute reagent contact followed by 3 minutes of residual incubation at 37°C
Formula Characteristics	Enzyme-free, protein-free, and without added human- or animal-derived components
Endotoxin	≤0.1 EU/mL
Filtration	<0.2 μm
Bacteria Detection	Not detected
Fungi Detection	Not detected
Storage	Room temperature
Shelf Life	12 months
Use	Research use only

Features

Integrated dissociation and selection: selectively releases undifferentiated hESC or hiPSC colonies while differentiated areas can remain attached to the culture vessel.
Enzyme-free passaging: supports non-enzymatic human pluripotent stem cell dissociation without proteolytic digestion.
Rapid protocol: uses a 1-minute reagent exposure followed by a 3-minute residual incubation.
Aggregate-based transfer: produces cell clumps with a recommended diameter of approximately 100–200 μm.
Limited mechanical manipulation: colonies can be released by gentle tapping followed by only one or two pipetting steps.
Protein-free formulation: contains no added protein and no added human- or animal-derived components.
Designed for hPSC culture: intended for routine passaging of human embryonic stem cells and human induced pluripotent stem cells.
Convenient storage: supplied as a ready-to-use working solution that can be stored at room temperature.

How XR InstantSelect Works

XR InstantSelect uses an optimized ion-chelation mechanism to weaken cell-to-cell and cell-to-surface interactions without enzymatic digestion. The short contact step initiates colony dissociation, while the residual reagent remaining on the cell layer continues the process during the subsequent 3-minute incubation.

When the plate is gently tapped, undifferentiated colony regions detach as aggregates suitable for transfer. Spontaneously differentiated areas may remain attached, enabling selective collection of the undifferentiated portion during routine hESC or iPSC passaging.

XR InstantSelect rapid hESC and iPSC aggregate dissociation workflow showing 1 minute treatment and 3 minute incubation

Rapid 1-minute exposure and 3-minute residual incubation workflow.

Selective Detachment of Undifferentiated Cells

Unlike a general-purpose cell dissociation reagent that releases the entire culture indiscriminately, InstantSelect is designed to support selective detachment. After treatment, the undifferentiated portion can be collected by gentle tapping, while visibly differentiated areas can remain on the plate for exclusion from the transferred population.

Selective detachment of undifferentiated hESC and iPSC colonies while differentiated cells remain attached

Selective collection of undifferentiated hPSC colonies during passaging.

Recommended Passaging Protocol

Remove the spent culture medium from the hESC or hiPSC culture.
Wash the culture with calcium- and magnesium-free DPBS to remove residual medium and cellular debris.
Add 1 mL of XR InstantSelect to each well of a 6-well plate.
Incubate the plate at 37°C for 1 minute.
Aspirate the InstantSelect working solution immediately after the 1-minute exposure.
Return the plate to the 37°C incubator for an additional 3 minutes. Residual solution on the cell surface completes the aggregate dissociation step.
Add 1 mL of culture medium to the treated well.
Gently tap the edge of the plate to release the undifferentiated cell layer as small aggregates.
Pipette gently one or two times to obtain aggregates approximately 100–200 μm in diameter.
Transfer the resulting cell aggregates according to the laboratory’s established hESC or hiPSC culture procedure.

Important: Avoid excessive pipetting, which may produce aggregates smaller than the recommended 100–200 μm range. Actual timing may require optimization according to cell line, colony density, culture matrix, and laboratory conditions.

Passaging Workflow Comparison

Workflow Consideration	XR InstantSelect	Conventional Enzymatic Dissociation	Conventional EDTA-Based Passaging
Dissociation Principle	Optimized ion-chelation approach	Proteolytic enzyme activity	Chelation-based dissociation
Enzyme-Free	Yes	No	Yes
Transfer Format	Cell aggregates	Often single cells or small clusters, depending on protocol	Cell aggregates
Recommended Processing Time	1-minute contact plus 3-minute incubation	Protocol-dependent	Commonly longer than the InstantSelect workflow
Selective Detachment	Designed to release undifferentiated regions while differentiated areas remain attached	Generally dissociates treated cells without selective colony enrichment	Not specifically designed for selective undifferentiated-cell detachment
Mechanical Handling	Gentle tapping and one or two pipetting steps	Protocol-dependent	Gentle tapping or pipetting

Applications

XR InstantSelect is designed for human pluripotent stem cell laboratories that require a rapid, enzyme-free method for routine aggregate passaging. Its selective dissociation workflow is particularly relevant when researchers need to transfer undifferentiated colonies while minimizing the carryover of visibly differentiated areas.

Routine hiPSC passaging: non-enzymatic dissociation of human induced pluripotent stem cell colonies into transferable aggregates.
Routine hESC passaging: aggregate-based transfer of human embryonic stem cells without proteolytic enzymes.
Human pluripotent stem cell maintenance: regular hPSC culture workflows requiring controlled colony breakup rather than complete single-cell dissociation.
Selective undifferentiated-cell collection: separation of detachable undifferentiated colony regions from differentiated areas that remain attached.
Clump passaging: preparation of hESC or hiPSC aggregates approximately 100–200 μm in diameter.
Colony passaging: transfer of pluripotent stem cell colonies using gentle tapping and limited pipetting.
Enzyme-free stem cell culture workflows: replacement of proteolytic dissociation steps where aggregate-based passaging is preferred.
Reduction of differentiated-cell carryover: routine culture workflows in which visibly differentiated regions need to be excluded from the transferred cell population.
Expansion before downstream research: passaging of hESCs or hiPSCs before laboratory-defined characterization, differentiation, gene-editing, disease-modeling, or other research workflows.
Standardized PSC handling: laboratories seeking a short, defined contact-and-incubation sequence for routine human pluripotent stem cell passaging.

When to Use Aggregate-Based hPSC Passaging

Human pluripotent stem cells may be transferred either as aggregates or as single cells, depending on the established culture system and downstream objective. XR InstantSelect is specifically intended for aggregate-based passaging rather than complete single-cell dissociation.

This format is suitable when the laboratory protocol calls for maintaining cell-to-cell contact within small hESC or hiPSC clumps. The recommended 100–200 μm aggregate range provides a practical visual target during passaging and helps prevent unnecessary over-dissociation.

For workflows that specifically require a uniform single-cell suspension, researchers should use a dissociation method validated for that purpose instead of extending the InstantSelect incubation or applying excessive mechanical pipetting.

FAQ

What is XR InstantSelect used for?

XR InstantSelect is an enzyme-free hESC and iPSC passaging reagent used to dissociate human pluripotent stem cell colonies into small aggregates. It is designed to selectively release undifferentiated colony regions while differentiated areas can remain attached to the culture vessel.

Is XR InstantSelect an enzymatic cell dissociation reagent?

No. XR InstantSelect is a non-enzymatic cell dissociation reagent. It uses an optimized ion-chelation approach instead of proteolytic enzymes to support hESC and hiPSC aggregate passaging.

Which cell types can be passaged with XR InstantSelect?

The reagent is intended for human embryonic stem cells and human induced pluripotent stem cells. It is specifically designed for hESC and hiPSC colony or aggregate passaging workflows.

Does XR InstantSelect produce single cells or cell aggregates?

XR InstantSelect is designed for aggregate-based passaging. Under the recommended procedure, gentle tapping and one or two pipetting steps produce hESC or hiPSC aggregates approximately 100–200 μm in diameter.

What is the recommended InstantSelect treatment time?

Add the reagent and incubate the culture at 37°C for 1 minute. Aspirate the solution immediately, then return the plate to 37°C for an additional 3 minutes so that residual reagent on the cell layer can complete the dissociation process.

How much InstantSelect should be used in a 6-well plate?

The recommended procedure uses 1 mL of InstantSelect per well of a 6-well plate after washing the culture with calcium- and magnesium-free DPBS.

Why is the InstantSelect solution aspirated after only 1 minute?

The product protocol uses a short initial contact period followed by residual incubation. After aspiration, the small amount of reagent remaining on the cell surface continues the dissociation process during the subsequent 3-minute incubation.

How does XR InstantSelect support selective dissociation of undifferentiated cells?

Following treatment, undifferentiated colony regions can be released by gently tapping the plate. Differentiated regions may remain attached, allowing the detachable undifferentiated aggregates to be collected for passaging.

What aggregate size should be targeted during hESC or iPSC passaging?

The recommended aggregate diameter is approximately 100–200 μm. Pipette gently only one or two times after the colonies detach to avoid producing excessively small cell clumps.

Should the cells be washed before adding InstantSelect?

Yes. Wash the culture with calcium- and magnesium-free DPBS before treatment to remove residual culture medium and cellular debris.

Does XR InstantSelect contain protein or animal-derived components?

The product is described as protein-free and does not contain added human- or animal-derived components.

Can XR InstantSelect be used when a single-cell suspension is required?

XR InstantSelect is designed for aggregate-based passaging rather than complete single-cell dissociation. For workflows requiring a uniform single-cell suspension, use a dissociation method validated for that specific purpose.

How should XR InstantSelect be stored?

Store XR InstantSelect at room temperature. The stated shelf life is 12 months when stored according to the product instructions.

What pack sizes are available?

XR InstantSelect is available in 100 mL and 500 mL pack sizes under catalog numbers XRINSELECT-1-100 and XRINSELECT-1-500.

Is XR InstantSelect intended for clinical use?

No. XR InstantSelect is supplied for research use only and is not intended for diagnostic, therapeutic, or clinical use.

Important Notice

This product is supplied for research use only. Culture response and optimal handling may vary with cell line, passage history, colony density, culture matrix, medium, and laboratory conditions. Researchers should validate the passaging procedure within their established human pluripotent stem cell culture system.

XR InstantSelect - hESC/iPSC Selection & Aggregate Passaging Reagent